Thermal Desorption GC-MS for Malodor Compound Detection
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Solution Overview
Problem
Current methods for detecting malodor-causing volatile compounds in sweat are inefficient due to low sensitivity and reproducibility, primarily because these compounds adsorb onto detection apparatus surfaces, making it difficult to effectively combat axillary malodor development.
Innovation Solution
The method involves thermal desorption GC-MS with selected ion monitoring to directly detect and quantify 3-methyl-2-hexenoic acid, 3-hydroxy-3-methylhexanoic acid, and 3-methyl-3-sulfanylhexan-1-ol from the axilla headspace or clothing samples, using adsorbent materials treated to prevent compound adsorption, and forming esters for GC-MS/MS analysis to enhance detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods are used to detect malodor-causing volatile compounds in sweat, then the detection process is simple, but the sensitivity and reproducibility are low due to compound adsorption onto detection apparatus surfaces
Solution Approach 1:
The patent introduces an intermediary substance (e.g., derivatizing agents, adsorbent coatings, or protective layers) that mediates between the malodor-causing volatile compounds and the detection apparatus surfaces. This intermediary prevents direct adsorption of the compounds onto the detection surfaces, thereby maintaining detection sensitivity and reproducibility while allowing the use of conventional detection methods.
Solution Approach 2:
The patent modifies physical or chemical parameters of the detection system, such as changing the surface properties of the detection apparatus, adjusting the temperature, or altering the chemical state of the compounds (e.g., through derivatization). These parameter changes reduce the adsorption tendency of the volatile compounds onto the detection surfaces, thereby improving detection sensitivity and reproducibility.
2Quantity of substance
If adsorbent materials are used to collect samples, then compound adsorption is enhanced for concentration, but the compounds may be lost due to strong adsorption making extraction difficult
Solution Approach 1:
The patent employs periodic or sequential actions in the sample collection and extraction process. For example, the adsorbent materials are used to concentrate compounds during a first phase, then specific conditions (such as solvent composition, temperature, or pH) are periodically changed to release the compounds for extraction. This periodic action allows both effective concentration and easy recovery of the compounds.
Solution Approach 2:
The patent changes physical or chemical parameters (such as solvent type, temperature, pH, or ionic strength) to control the adsorption-desorption equilibrium. By adjusting these parameters, the compounds can be strongly adsorbed onto the adsorbent materials for concentration, then easily desorbed when the parameters are changed, facilitating simple extraction without compound loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly increases the sensitivity of malodor compound detection, allowing for the identification of compounds that prevent or reduce malodor development on body surfaces by quantifying these volatile compounds at lower concentrations, thereby effectively addressing the limitations of existing methods.
Implementation Method 1
adsorbing the collected sample onto an adsorbent material
Implementation Method 2
determining, in the adsorbed collected sample, the amount of at least one malodor causing volatile compound by thermal desorption GC/MS
Implementation Method 3
forming an ester of the at least one malodor causing volatile acid compound
Data Source
AI summary
The present disclosure related to a method for screening compounds having the ability to prevent, treat or reduce malodor development on body surfaces. In particular, the method screens for compounds having the ability of preventing sweat malodor development caused by malodor causing volatile acid compounds and/or malodor causing volatile sulphur compounds. The present disclosure is based on a sensitive analytical method to determine the presence of the precursors of malodor causing volatile acid compounds and/or malodor causing volatile sulphur compounds present in sweat, which are metabolised by bacteria, such as, for example, Cornebacteria or Staphylococci to malodor causing volatile acid compounds and malodor causing volatile sulphur compounds.